Переходи на сайте irkmix.top и получай много эмоций из Russia
Answer:
29260 lb.ft
Explanation:
Elemental Volume of the stone is
dV = πr²dh
r varies linearly from 4 at the base (h=0) to 0 at h=10
Using the concept of similar triangles,
(r/4) = (10-h/10)
r = 4 - 0.4h
dV = π(4 - 0.4h)² dh
dV = π (16 - 3.2h + 0.16h²) dh
dweight = ρdV = 70 dV
dweight = 70π (0.16h² - 3.2h + 16) dh
dWork = dweight x distance
dW = 70π (0.16h² - 3.2h + 16)h × dh)
dW = 70π (0.16h³ - 3.2h² + 16h) dh
dW = (70π) ∫¹⁰₀ (0.16h³ - 3.2h² + 16h) dh
W = (70π) [0.04h⁴ - 1.067h³ + 8h²]¹⁰₀
W = 29260 lb.ft
Answer:
-2R
Explanation:
The focal length can be calculated using this formula
1/f = (n1/n2-1)(1/r1-1/r2)
1/f = (1/1.33-1)(1/r + 1/r)
= -0.133/1.33(2/R)
F = -2R
The focal length is this
Explanation:
In order to calculate the work from r = a to r = b we only need to convert 1000 km into 1,000,000 m.
Since, the given data is as follows.
G =
= 1000 kg
a =
b =
=
Now, we will calculate the work as follows.
W =
=
=
thus, we can conclude that work required to launch the satellite is .